I sleep from 10:30PM - 5:15am weekends and weekends no regular schedule. I play tennis from 5:30am to 7:30am so I feel tired at 10:30pm and need to sleep immed

I sleep from 10:30PM - 5:15am weekends and weekends no regular schedule. I play tennis from 5:30am to 7:30am so I feel tired at 10:30pm and need to sleep immediately. But I never require alarm to wake up, somehow I end up waking up at 5:15am for sure